| 黄小卫，蔡晔，郭强，蒋弘毅，郭远建，高洋洋，王臻魁，国振.悬空海底电缆波致运动和疲劳寿命数值研究[J].海洋工程,2025,(5):154~167 |
| 悬空海底电缆波致运动和疲劳寿命数值研究 |
| Numerical investigation of wave-induced motion and fatigue life of a suspended subsea cable |
| 投稿时间：2024-08-01 修订日期：2024-12-11 |
| DOI：10.16483/j.issn.1005-9865.2025.05.015 |
| 中文关键词: 海底电缆 悬空 波致运动 疲劳寿命 塑性屈服 |
| 英文关键词:subsea cable suspension wave-induced motion fatigue life plastic yielding |
| 基金项目:中国南方电网有限责任公司科技项目（CGYKJXM20220141） |
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| 中文摘要: |
| 针对跨越琼州海峡某海底输电电缆的实测悬空段，基于海洋工程动力学分析软件OrcaFlex，构建了悬空海缆波致运动和疲劳特性数值计算模型，研究了悬空海缆的运动、疲劳及塑性屈服特性随波流条件和悬空长度的变化规律。结果表明，海缆的铅合金护套层最易疲劳，其疲劳性能决定了海缆的整体疲劳寿命。铅合金护套的疲劳寿命并不随悬空长度的增大而单调减小，而是在悬空长度5~10 m附近出现最小值。在1年一遇波流叠加工况下，铅合金护套的最小疲劳寿命仅0.9 a（引入安全系数10后）。通过多次现场扫测发现，实际环境中较易发生5~10 m的悬跨，因此可以认为海缆的铅合金护套极易发生疲劳破坏。在50年一遇波流叠加工况下，铅合金护套的最小疲劳寿命仅1.1 d（引入安全系数10后），接近极端台风浪过境一次的时间尺度，且铅合金护套在任意悬空长度下均会发生塑性屈服。研究成果为保障海缆的在位安全运行提供了重要理论支持。 |
| 英文摘要: |
| This article focuses on an actual suspended section of a subsea power transmission cable across the Qiongzhou Strait. Based on the marine engineering dynamics analysis software OrcaFlex, a numerical model for the wave-induced motion and fatigue characteristics of the suspended subsea cable was established. This study investigates how the motion, fatigue, and plastic yield characteristics of the suspended subsea cable vary with different wave and current conditions and suspension lengths. The results indicate that the lead alloy sheath layer of the cable is most susceptible to fatigue, which determines the overall fatigue life of the cable. The fatigue life of the lead alloy sheath layer does not decrease monotonically with increasing suspension length but reaches a minimum around 5~10 meters suspension. Under a one-year-return combined wave and current condition, the minimum fatigue life of the lead alloy sheath is only 0.9 years (after applying a safety factor of 10). Multiple field surveys revealed that suspended spans of 5~10 meters frequently occur in practice, suggesting that the lead alloy sheath of the subsea cable is highly prone to fatigue failure. Under a fifty-year-return combined wave and current condition, the minimum fatigue life of the lead alloy sheath is only 1.1 days (with a safety factor of 10), approximately matching the timescale of a single extreme typhoon event and plastic yielding occurs on the lead alloy sheath for any suspension length. This study provides important theoretical support for the in-situ safe operation of the subsea cable. |
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